The 4.7 is actually a very reliable engine. The unreliable part on trucks with this engine is the cooling system. A clogged radiator will have trouble keeping up with the engine while idling often due to a bad fan clutch on the main fan and an electric fan that won't kick in until the engine is already running too hot. Things you should do to keep it reliable is: -Drain and replace your coolant every 4 or 5 oil changes -Run the proper orange Mopar coolant and bleed the system properly -Check on your fan clutch + water pump periodically and replace as needed (it's cheap and almost all of the 4.7s I've seen blow up have had a weak/dead fan or water pump) -Avoid just sitting there idling the engine for hours at a time on hot days like it's a diesel **Optional Upgrades to make it super reliable** -Modify or replace auxiliary electric fan so it can be activated with a toggle switch -Replace the mechanical fan with an electric fan out of the V6 models -Replace the thermostat with a higher flow model if you live in warmer climates (not ideal for winters) In short the necessary items are all applicable to most other engines from the time period and all of the optional upgrades can be done for less than $500 and 2 hours all in. Pretty good bang for your buck frankly. I like the Hemi better but the 4.7 is the more reliable motor.

This channel is therapeutic. Don't stop.

373,000 on my 2001 4.7L. In my book one of the best small V8's ever made...maybe the best ever! Oil changes and spark plugs is all its needed. Still rocking the OEM coils and fuel system too.

I got a 4.7 in a 2004 Durango with 290k miles. If you take care of this engine it will last. A lot of these engines where neglected and poorly maintained. I love my 4.7 and will never sell it!

I remember when you found the pushrod would work perfectly as a puller, and now here we are many episodes later still doing the same trick 😂😂

As far as using a screwdriver as a prybar/chisel, remember the famous words of Red Green. Red said: "Anything other than a China plate and a digital watch can be used as a hammer". And "Any tool can be the right tool". This is where all my old screwdrivers end up, as teardown tools. That valve arrangement reminds me of the old 318 polysphere engine.

Remember yall, VERY IMPORTANT to treat broken chain guides with care and respect, always cloth wrap then when setting them down, and also ALWAYS give a reassuring pat after setting them down. This is ESSENTIAL maintenance.

I have had amazing experience with my 4.7. Currently at 275,629 miles and climbing in my ram 1500

Doing it just for us. That's why you rock Eric. Thanks man.

I really enjoy watching your tear down videos; normal dude, good content and great editing skills. You have the personality of someone that would be fun to hang out in the garage, working on vehicles.

Ahhh the good ol 4.7.. the first engine I tore down completely in a professional setting. I only had to because the used replacement engine we got was for a later model, a 32 tooth as shown in the video... And the truck was an 04 1500. Found that little fun fact out the hard way when the engine would crank and sound like the cams were installed backwards. So I pulled it back out, tore it all the way down, swapped the rings, put it back together and put it back in the truck. Ran like a champ. And it earned me a little respect from the shop owner, since he didn't have to explain to the lady how he bought the wrong engine for her truck.

The 3.7 was the real over achiever of the two. 210 hp and 230-240ft-lbs in relatively small vehicles is a pretty capable package. I enjoyed towing a 21' bass boat with my old Jeep liberty and a 3.7, it didn't break a sweat.

After he said "I'd definitely reuse these cams" I was 100% expecting him to throw them into Illinois. Lol

My 06 Ram 1500 ( had it since it was a year old)4.7 blew a head gasket at 182k miles. Pulled the engine and had the heads machined, valve job, seats then replaced timing chains, gaskets, oil pump, sensors, and motor mounts ( aftermarket) and engine is running great till the other day after 2k miles and it started misfiring. cylinder 6. Low ohm reading in the fuel injector so I should have replaced all of those as well. All I did was put new o-rings on them. Lining up 3 timing chains is what scared me but wasnt bad thanks to the mechanic on youtube doing a complete teardown and rebuild. ..A first for me. Enjoy watching teardowns now and appreciate your channel!

I enjoy that you take joy in the extra editing, and work for the puns, "Not that pick-up" You're A-number 1 Eric!

Had an 04 Dakota with this motor, got me through 5 years in the army and about 85k miles after buying it with 55k. Take care of these motors and they are actually really reliable. 13 hours across Texas several times a year proved it to me.

Have older Dodge Ram with a 4.7, the primary death item is the cam chain tensioner system. The tensioners wear out and thus it places particles in the lube system and the associated self-adjusting cam timing. On the Right-hand bank has the ignition timing wheel. Know from experience if the cam tensioners start going you get constant ignition timing issues. But after having 177k on the engine things seem to be good for compression, oil pressure etc. Another death concern is the rocker arms/lifters, you start hearing ticking "FIX IT NOW". They are shockingly more reliable than you would think, gutless wonders but they seem to work fine. Sort of reminds me of a Chevy C30 with the old 283, you gotta rev the holy shit out of it to get any power. Think they got a bad wrap because they replaced the 318, which you have to be creative to break. If cared for they appear to be able to last quite a while.

I have an 04 4.7 I have upgraded to the 4.7 HO cams and the HO intake. Cloyes timing set, Melling rockers and had the heads machined to fix that "dropped valve" issue. Man that double overhead cam engine sounds amazing flowing through some flow master original series mufflers.

Years ago, a coworker (fellow mechanic) bought a 2004 Grand Cherokee with a 4.7. Didn’t know anything about it other than it had a bad engine, but it was very cheap. Turns out it had dropped a valve seat, broke the piston and turned the engine in to shrapnel. He did zero research before buying it, assuming that used 4.7s would be plentiful. He couldn’t find a single good used one anywhere for any price. He ended up spending about $3000 on a reman engine. He swapped in the new engine, cleaned it up really nice, started it up and it ran fantastic. It cost way, way more than he’d planned on, but it seemed like things would be fine…until the first time he drove it. Merging into the freeway he gave it a little throttle and started misfiring and clattering. He brought it back to the shop, determined one cylinder had no compression. He called the place he bought the engine from, they asked him to take the head off on that bank. He found a piece of the old, broken piston rings stuck in one of the valves, holding it open, beating the crap out of the head and the piston. The only thing he could figure is that broken engine pieces ended up in the intake manifold (which is why OEMs tell you to always replace the intake manifolds after a catastrophic failure). Anyway, long story slightly less long, he ended up buying a new piston, having the head repaired, buying a used intake (I think), doing all the work himself (and paying for all of it). This all happened over the course of like 6 months, and I got to hear the horror stories every. single. day.

Had 04 HO version in a grand Cherokee. Best engine I ever had. Sold it with 264k on it only had 1 engine issue at 249k - broken valve spring - easy fix and back on the road. Never ever heated up or used any oil, I did good preventative maintenance. Still miss that Jeep.

These were a big mainstay for Chrysler and they ran for a great while as long as they were maintained.

I had 99 wj with a 4.7 with 280 k and it wasn't ever well taken care of but still ripped good when I scrapped it. I have respect for those

Really cool to see this engine. I’m an AMC lover and from what I recall this engine was a design that AMC was working on when they were bought by Chrysler. I think it was going to be their first OHC engine. 👍🏼

8 years ago I needed a cheap 4x4 for launching and retrieving my boat from steep and slippery boat ramps. I saw a 2001 Jeep GC for sale with an engine tick noise so I went to see the car and instantly fell in love with it. The body and paint and leather interior was perfect and very well kept but the engine tick was a knock. I Still purchased the car with a very heavy discount and installed a full reco engine which is a HO engine. I still have the Jeep and its still my pride and joy. I change the engine oil and filter every 5000km and only use 95 RON fuel. It came with the HD242 TC and it does everything I need it to do. The 4.7 is more bark than bite but I don't care, I love the V8 note.

I have had the unfortunate experience in rebuilding one of these motors for my 2000 durango and I have some notes from experience that you may find interesting. 1. when taking my heads to my reputable machinist, he told me that the heads fail because of the materiel they are cast from and that they arent worth re machining, so I bought new ones from engine tech and had mild cams put in them. 2. timing this motor is a solid half days work, seeing as how I've done it twice I cannot explain how meticulous you have to be when doing this job. 3. the head bolts and main cap bolts are torque-to-yeild bolts and can only be torqued and used once. and they run about $65 a set (ask me how i know)\ 4. the rod caps and rods themselves are called cracked rods. a seamless break in the metal so when put back together form a perfect seal. 4.5. I've yet to figure out why the head gaskets have the pin-hole water jacket design, so if anyone knows, fill me in.

I had a 2000 Dakota with the 4.7 and drove it over 20 years. Sold it with 243,000 miles on it, and it was still running good. I loved that truck, but the interior plastic parts were failing frequently when I sold.

I miss the 4.7, 05-07 2nd gens were kind of the sweet spot where they fixed the 1st gen issues without the complexity of the 3rd gen. Had one in my 06 Dakota and it definitely punched above its weight. Just wish it could have stayed long enough to get the 8 speed transmission.

My personal experience with these 4.7s is definitely iffy. I used to have one. Got 170k out of it before it dropped a seat on cylinder 5. Sold the truck shortly after. My biggest issue I had is I knew of the common issues with the 4.7 but my problem wasn’t that it overheated… I drove the truck to Colorado from Texas. Parked it for a few days in freezing temps and ended up losing a valve seat because of the coolant losing its “anti freezing” capabilities. Hairline cracked the head on the seat and dropped the seat. My issue was that I didn’t maintain it. Coolant changes are important yall.

To those naysayers; Some screwdrivers are intended to be chisels, I've a set that has a metal striking surface on the handle exactly for that reason... and besides when's the last time you needed a flat head screwdriver in the automotive world as an actual screwdriver? (usually they just get used as prybars).

Well there you go again Eric, you've found another one that I have been really interested in for a long time now. So from what I've read about these engines is, if you have to rebore them at the time of rebuild your screwed, because the cylinder walls are just to thin to do so safely. Other than that I've heard that they are actually pretty good engines. But boy there sure are a lot of people out there who really hate these 4.7L's to death. But then that's what really makes me take a good, hard, long, close, look at them, simply because when everybody hates them, you can get them for, well, like you said, nothing at all.... Lol. note: I'm the kind of person who likes taking the things that everyone desperately hates and despises and really make them shine. To me that's what's really really fun.... Oh, and I just want to thank you "again" Sir, for the "Northstar" tear-down, the LH2 version is currently my favorite engine of all engines.

YES! A PowerTech! Finally! You’re the best, man!

Screwdrivers have handles for increased holding precision, most chisels do not. My wife's 2001 Durango 4.7 V8 has 166,000+ miles and runs great(purchased new). I have stayed on top of the regular maintenance. It does have the "chain slap to the tensioner guides" upon the first start of the day but settles right out.

Absolutely love these tear downs...still looking forward to the 360 magnum tear down

A relative had an early 2000s Durango with this 4.7 SOHC V8 and I was always impressed with the power it made at the time. Ran great still when it was sold. I always thought this is the engine they should have put in that crazy Plymouth Prowler instead of the 3.5L V6.

I own a 04 overland with the 4.7 H.O. been daily driven for 18 years. Great engine!

@ op, the valve is bent cause the seat "dropped". When 3.7/4.7 seats "drop", they hardly ever break (and fall completely out) like the 5.7 Hemi seats do. The result is generally a small to moderate indentation on the top of the piston in that cylinder, and a bent valve. I really have only seen maaaaaybe a couple 4.7s and ONE 3.7 with catastrophic damage from a shattered valve seat. Literally every single one of them had a seat that momentarily popped out, and since it was hanging on the back side of the valve, which "centered" the seat across the valve, when the engine was cranked over upon starting again, the piston FORCED the seat BACK into the head, bending the valve and marking up the piston in the process. Most of the time, the seat won't be perfectly centered In the seat bore after this happens, so it'll kind of stick out, which keeps the valve too far down in the combustion chamber and will result in an engine "knocking" when it's started back up, as the piston repeatedly "taps" on the valve head. Still no catastrophic failure, cause the seat can't come out again due to it literally being jammed in the head over and over again by the piston.

I’ve heard these are pretty great little engines, with a decent amount of power potential

Always thought the 4.7 was an underrated engine, especially after the 08 revisions.

Still think these are one of the best engines to work on.

First time I saw this video, you rock. I have a 2000 Dodge Durango and Mt timing chain broke, engine was o.k., I didn't get lucky, the good man upstairs gave me a break. You taught me a ton just watching you and you're attitude made me 😂, thanks man.

What probably happened was that harmonic balancer not being torqued down properly. The woodruff key is only there to align the crank gear and the crank gear is friction fit/held by the harmonic balancer. An insufficiently torqued down balancer will cause it to strip the key.

I had two vehicles with this engine: a 2003 Dakota and 2004 Grand Cherokee. Both engines blew a head gasket right at the 135k mile mark. The engines are impressive with the power they can make, but I I wouldn't care to own another one. I'd much rather have the 5.2 or 5.9

Thanks for this tear down! At 200k + miles on mine. Rebuilt trans. Other than that. Always pulls. Not the fastest in the block. But always starts and goes.

I might be the only weirdo that like the 4.7. Had one in a wj. I beat the crap out of it and just keep going. Got reasonable mileage for an awd too lol

Eric, ehe moment you mentioned "dropped valve seat" my mind immediately was reminded of the dropped valve seat on my other half's '02 Heep Liberty with the 3.7L V6 based on a very similar design to this turd. I work in a professional shop as a mechanic but re and re-ing cylinder heads on that 3.7 wasn't on my bingo card for my lifetime. Much fun, thankfully a local machine shop did a fantastic job fixing the heads.

Nice, didn't expect this one! People dunk on this motor a lot but I've had several and they've all been fine. Ran well, reliable, good power, decent fuel economy, no complaints here.

I had a 4.7 05 ram 1500 since I was a teenager. It lasted until last December because someone decided to not pay attention and hit me. The only issues I had with the engine were overheating issues when towing, and it would make a knocking or ticking sound on a cold startup, which would go away after the engine would run for a minute or so. Overall I loved that truck and it did its job. I also keep up the maintenance on it as well. It also had about 112k miles on it on point of death

Add me to the list of 4.7 owners without issues - my '99 Grand Cherokee had 230k on the clock when I sold it a few years ago, and other than a broken exhaust manifold bolt, was running great.

I like the architecture of this engine. Good bore stability and efficient cam chain runs. Never saw one that had a chain failure before.

How can any car guy not like these videos. Keep them coming.

My 2000 Durango 4.7 had die cast cam covers.Never had an issue with the engine.

Make a shirt that says “oh why did I smell that?!” Gotta be one of my favorite quotes.

Depends on what screwdriver you use as a chisel or punch. I caught one of my apprentices using one from a $400 SnapOn set. We all have old used ones that we use that way.

Eric is a man of the people ask and you shall receive!! I must of had more than 5 buddies that owned a Durango with completely rusted out wheel wells and a 4.7 under the hood 😂 thanks for another great teardown!!!

Thank you for showing the inside details of the 4.7 Powertech. I have one that has been completely rebuilt that is in a 1999 Jeep WJ 4x4. I have had no trouble with it so far. I do keep the oil changed. It gets 10 to 11.5 mpg in town and 21 to 22 on the highway. So far it has worked flawlessly in the three years I've owned it. 😊

Hello Eric, I drove a 99 Grand Cherokee from when I bought it new in May of 99 until I gave it to my son in 2015 when I got my 2015 Mustang GT in May of 2015. He drove it for several years and then sold it to a friend of his for $500. who I (think) gave it to a friend at his church who drove it for quiet a while and then had to do some major repairs to the engine. (Oil pump maybe) I really do not know how many miles it had on it when my son got rid of it but it had 135,000 when I gave it to him. I changed the oil every 3,000 miles except once when I let it go to 5,000 but when I saw how black it was went back to 3K. It was rated at 235 HP and I always loved the way that thing ran and got up and go-ed. I always wondered why Chrysler didn't put that engine in any of the other cars they had back then. I got rid of a 92 5.2L Dakota to get the Jeep and was really bothered by the fact that you couldn't get a 5.2 in the Jeep .(smile). George.

Love the channel Eric. Well done!

Thank you for supplying us with another video Eric. You da man!

I have a 2008 4.7. In my Durango. 208000 miles on it. Two things I’ve had to do, replaced. Water pump and lifters. After those two things. Runs amazing. Still strong. And great compression.

Great video. I have the 3.7 version of this engine. Really good video. Mine has over 285k miles on it, so I’m gathering up the courage to pull one from a junkyard and overhaul it, for the inevitable day when my engine fails. This video helps.

50/50 mix of ATF + Acetone = best version of liquid wrench. Also loved the “Not that pickup!” bit.

Been waiting on this one for a while, thanks chief! I loved it. :) Big fan of this engine btw, my 2010 Dakota Bighorn is a monster with this thing and i love it.

The cams you want are 08and newer in the wk grand cherokee 4.7. They (and the intake on an 08up) can be put on a 99-04 4.7 as an upgrade. Reference Martinbuilt on KZfaq

The only people who think this is an unreliable engine are the people who bought them used from people who didn't take care of them and then they didn't maintain them. Change the oil, don't over heat them. Keep up on regular maintenance. Thats it. I've driven a 4.7 powered WJ for 22 years now and have 250k. It's one of the smoothest, most reliable engines ever made. Tons of low end torque, plenty of high end power. Simple and effective - And thats coming from someone who had a 4.0 ZJ beforehand. The number one issue is blown head gaskets - which if you actually tear down and replace usually isn't even a gasket failure but a warped head from being over heated.

Eric, thank you so much for the content on your channel. I must say that in addition to the motors you deconstruct, I love your attitude. Your language is such that I could watch these with my grand sons. Your cynical outlook is very much in line with my own. Please keep up your good work.

Great content as always Eric. Always enjoy these teardowns. Honestly helps to give me a better understanding of my engines you have torn down thus far. First the 8.0l V10 Magnum which I have in my 95 Ram 2500 (still runs strong) and now the 4.7L I have in my 02 Durango which died past 200,000 due to PCM failure. Easy enough to fix. ENGINE REQUEST: Chrysler 2.2L NA Yep, the K-Car engine. If you can find one that is. There's probably not much money to be made on those engines but would be kind of neat to put those engines on the spotlight for an episode. A 2.5L NA would be just as fine. Turbo versions of those engines would be cool too. Probably a little more value to those. Either way, I enjoy what you bring to the table. Keep up the good work sir. Looking forward to future content.

I used to work a call center for one of those companies that buys junk cars and then sells them to junkyards. I once had a junkyard owner tell me that if I found a car with a good running 4.7 or 3.7 Powertech, he'd pay me double for it. He explained that he had a double-digit list of customers with blown-up Powertech engines looking for a replacement. That was the only time I ever heard anything like that. Years before, I'd been looking for a 97-04 Dodge Dakota, and specifically wanted the 4.7 truck. I ended up finding a 5.9 R/T which I still own today, 12 years later. I really DODGED a bullet on that one. The 5.9 may be absurdly heavy and use a comedic amount of fuel, but they always run. That Dakota has watched 4 Hondas come and go.

Had a ram 4.7 2008 (which was bumped to 310hp). It was a great truck. Sold it due to needing more towing capability but the engine and transmission were perfect. Never a hiccup. 200k miles at the time. It also had 16 spark plugs which I found interesting. 2 per cylinder.

That's a pretty solid design engine, I like seeing the features of the various engines.

I’ve had two 4.7s in two different 2003 dakotas. Put 200k miles on the first one and have 120k on the second. No issues except leaking exhaust gaskets (pita to fix) and they are very easy to work on. Very smooth, excellent burble and far more efficient than the 360 if the era.

I remember one of these were it dropped a valve seat and broke the timing chain. Literally just did a head swop and new chains and it ran for another 145k before the other head did the same and it was just another head swop and chains for another 60ish k before the jeep was wrecked. They are tough little engines but nothing will ever compare too the older i6 4.0 work horses.😅

Another 4.7 story here, my 4.7 ram has been towing boats and rv’s for basically the entirety of its 170k miles, and it really hasnt needed much.

Thanks for the Dodge 4.7 teardown. I have a 2002 Durango that just turned 200,000 this year. Guess I should be looking for timing chain wear in the near future. Love your videos, found you on U Tube about 2 months ago. Your tutorials with teardowns can be educational and humorous, keep it up.

My dad has a 2011 Ram with I believe over 220K miles. Never had an issue with the engine, but it is beginning to feel a little sluggish. Strange how it also doesn’t eat a drop of oil at this mileage.

I really like this Channel. Eric's presentation, editing and Irreverent "tongue in cheek" humor is always refreshing. Keep up the good work. I watch nearly every episode!!

Yes our Saturday night is complete!! Another teardown video.

Would love to see a volvo b8444s or a b5254t4. Love your videos and I look forward to them every week. Keep up the good work!

You really took one for the team this time! The things you have to do for good content.

Looks like your first time inside a 4.7L engine. This looks like a catastrophic failure of the left bank timing chain, as valves and pistons were not wiped out, because the engine rotation stopped instantly!!! I lost my ass on a 4.7L, 2002, Dakota, for a friend. Overheated, and warped the heads. The heads straightened easily enough, and I replaced all the valve seats, because an overheated engine almost always drops them at a later date!!! All new timing components, and YES!!! all new torque to yield head bolts!!! replaced cam followers (rocker arms) with the later ones with the small oil hole, all new lash adjusters (hydraulic lifters) and yet it still had the valves clattering. Oil pressure perfect @70PSI cold and 55 #'s hot. Put on a second set of lash adjusters, same problem!!! Not wanting to pay $44.00 each from Chrysler OEM parts for lash adjusters, I machined up my own manually adjusted ones. Still makes valve noises, but I know they will not collapse, and cause more problems. Runs great, replaced radiator as well, as I don't like repeat problems. This engine has a poor reputation, because of a poor cooling system, (radiator air flow issues), and PCV air flow issues not eliminating condensate in the lower block area. A later factory PVC modification seems to have solved that problem. Everything was very prone to sludge buildup, and thus lubrication failure to the lash adjusters, and valve stem lubrication. This engine had great potential, but suffered from engineering failures, like condensate, and cooling problems. If scrupulously maintained, Oil changes, and a constant watch on coolant levels, these engines would get many hundreds of thousands of miles, without major failures. I should add that only genuine Chrysler timing components should be used, especially lash adjusters!!! I just ran out of time and patients on this job, so I made solid adjustable lash adjusters so as to verify the real problem, as I suspected upper end oiling issues, even though massive amounts of oil were observed while running without the valve covers in place. I have never been back into one of these engines but have helped many others who were having problems with them. If they followed my advice, they never had another problem. If they didn't, well there was a very different outcome!!! LOL!!! Lots of time doing repeated R&R work!!! I liked your crank puller extension pushrod, the crank should be OK, but I would magnaflux the snout to be sure!!! Tim

would love to see a Mazda SkyActive engine teardown. I got one and want to see the technology inside. Otherwise another great video.

Absolutely love your content thank you for all of your tear downs and if I had to make a suggestion a 3800 Buick v6 I absolutely love these engines and would love for you to find one that’s cooked

Its about time you got a decent engine stand! Love your engine autopsies!

My cousin has a ram with that motor with 297,000 on it, it was beat on heavily and used as a work truck most of its life. It ran until it dropped a valve.

Love the timing guide spike!! Keep them up! Also words to live by...don't buy used chain guides lol. Do a Mazda rotary engine next. I hear apex seals taste Great lol.

next time you are removing a woodruff key, grab a pair of diagonal wire cutter pliars, and grab onto the end of the key, and pry the key out. the edge that you grab can use the tips of the pliars as a fulcrum. they almost always pop right out.

We had one of these 4.7s in a Dakota that we owned for 14 years. Never had an issue with it. What was a surprise is we never had an issue with the transmission, either.

Really enjoyed this one. I don't how I stumbled on the channel but I enjoy every teardown.

Great content to watch while eating breakfast on Sunday. Any chance you could do a VW VR6? Or even rarer, a W8 out of a Passat?

Am I the only one who finds myself saying "well, that's not good!" whenever I run into something that doesn't belong or is broken??? Am I watching too many of these? 😁

It looks like it was run until the timing chains became loose. And that one chain let go. I purchased a 2005 Dakota with just over 250k on the odometer. It had dropped the number 2 intake seat had dropped. But it was hanging on valve so the engine is being repaired. The timing chains were both lose so they were due to be replaced. I am replacing the oil pump and the timing chains at the same time as the heads.

Very good! I was watching this while watching Fantom Works on Motor Trend on TV.

I have a Durango with a 4.7 with 457000 miles and still going strong. It's a daily driver

How about an original Saturn S-series engine? 1.9L 4cyl in either SOHC or DOHC would be fantastic to see a teardown. 5th or 6th request now? Keep up the fantastic work!

Ahhhhhh, Sunday morning on the porch with coffee and Eric and another teardown, Life is good.😊

I am so glad the broken woodruff key did it's job and saved the engine.

I might be three days late but I'm super excited to see this tear down. I really enjoyed my 4.7 powered Ram 1500 After watching the video, the 4.7 looks like a fairly stoutly built engine that would tolerate a decent bit of boost.

These are great engines. The problem is, the radiators tend to crack and leak due to over pressurization because of faulty overflow container caps that don't open at the 16 PSI they are supposed to open at. You don't realize there's an issue until your gauges are going crazy and your temperature quickly goes from normal to 260F in seconds. Once this happens, it's too late. The heads have already overheated, seats fall out and valves and pistons get damaged.

I love my 4.7s always had my back actually never had one break on me ever, just do your oil changes and change your coolant and thermostat , any aluminum head engine is sensitive to over heating.

I've rebuilt mine twice so basically on my third, both times it was due to piston rings expanding and breaking pieces of the piston crown off and that causing it to loose compression and damage a spark plug. Both times I could hear preignition happening when pressing the gas basically under load. The WJ was not overheating but I had installed a superchips tune, which I really think is the root of the problem timing probably too advanced under load, and older models dont have knock sensors like the HO. When I rebuilt the engine I gapped the top piston rings to street strip spec chart I found on engine builders magazine, basically the same gap as the second ring to prevent this from happening again and also of course getting rid of the superchips tune. The Achilles heel of this engine is the hydraulic lifter popping out and cooling system on mine also I noticed the electrical fan relay kept blowing I replaced motor hard wired connection, clean radiator etc and it kept blowing the special relay which I kept replacing often. Bought a heavy duty relay and connected to that one and the issue is no longer, relay to relay and now getting power straight from the battery. I am very surprised with the information this guy knows. From 16 to 32 tooth and crank sensor tone wheel which reflects to the ammount of ecu connectors. The only thing he forgot is that the reason the newer has 3 connectors is because the ecu has transmission control the 2 connector ones the 3rd connector goes on a separate transmission control module. I dont know but I really dont think these engines are as reliable as other people posted here, still I would like to try out a corsair 4.7 which came on the last Ram dakotas, it makes way more power than the regular and HO ones. Great video for anyone looking for working on one of these, I dont think this engine on particular failed on its own, someone probably didnt install the woodruff key correctly on something.

You are not doing this tear down for the video, you are doing this tear down for us the viewers.